Seasoned Pro

30

Completed all 4 Levels in 'Normal' difficulty mode

You need to complete every section of all four levels of the Story mode on the Normal difficulty level. This can done in either Singleplayer or Co-op, but do not try to mix your playthrough up with both as this can cause your game to lose progress. Normal difficulty itself isn't very hard, the first 2 levels are quite easy, the last 2 get a little more challenging. Having a decent rank in each of your skill categories helps tremendously.